Finding the Fourth Proportional to 111.03, 165.89 and 105.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.03 : 165.89 = 105.99 : x
2. Step 2: Convert to fraction form
   111.03/165.89 = 105.99/x
3. Step 3: Cross multiply
   111.03x = 165.89 × 105.99
4. Step 4: Simplify right side
   111.03x = 17,582.15
5. Step 5: Solve for x
   x = 17,582.15/111.03
6. Step 6: Final answer
   x = 158.35